Ensure config/apps.config.php get copied

[vfreex]

PR #115 breaks the logic that config/apps.config.php get copied
after custom_apps: #115 (comment).

This patch is going to copy that file if it doesn't exist.

[SnowMB]

Thanks for the quick fix!

[tilosp]

@vfreex @SnowMB this cp is there to upgrade existing setups which were created before #65.
I thought it would be safe to remove it because most of the setups are upgraded by now.
But maybe i am wrong.
If we want to keep it we should use the old check. Because right now the file will be recreated in case the user decides to remove it.

[vfreex]

@tilosp
By default custom_apps is empty if the user haven't installed any apps. In that case, the script don't know if the config file has been deleted by the user or it hasn't been copied. So the old check doesn't work.
I would suggest creating an empty file to prevent from copying, but the user should learn about that.

[tilosp]

@vfreex
I do not want to check if the custom_apps folder is empty. In old setups there simply is no custom_apps folder.

for dir in config data themes; do
    if [ ! -d /var/www/html/"$dir" ] || directory_empty /var/www/html/"$dir"; then
        cp -arT /usr/src/nextcloud/"$dir" /var/www/html/"$dir"
    fi
done
if [ ! -d /var/www/html/custom_apps ]; then
    cp -a /usr/src/nextcloud/config/apps.config.php /var/www/html/config/apps.config.php
fi
if [ ! -d /var/www/html/custom_apps ] || directory_empty /var/www/html/custom_apps; then
    cp -arT /usr/src/nextcloud/custom_apps /var/www/html/custom_apps
fi

[vfreex]

@tilosp
But if I mount custom_apps from a volume, it will not copy apps.config.php, resulting in a permission error because apps is not writable by default in this image.

[vfreex]

Sorry, my mistake. This situation only happens when upgrading from an old version because in newer version the whole config will be copied.
Your solution looks better than mine.

[tilosp]

I implemented this in #119